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Spatial and Temporal Wall Temperature Fluctuations in Two-Phase Flow in Microgap Coolers

[+] Author Affiliations
Jessica Sheehan, Avram Bar-Cohen

University of Maryland, College Park, MD

Paper No. IMECE2010-40227, pp. 1701-1708; 8 pages
doi:10.1115/IMECE2010-40227
From:
  • ASME 2010 International Mechanical Engineering Congress and Exposition
  • Volume 7: Fluid Flow, Heat Transfer and Thermal Systems, Parts A and B
  • Vancouver, British Columbia, Canada, November 12–18, 2010
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4444-1
  • Copyright © 2010 by ASME

abstract

Heat transfer to an evaporating refrigerant and/or dielectric liquid in a microgap channel can provide very high heat transfer coefficients and volumetric cooling rates. Recent studies at Maryland have established the dominance of the annular flow regime in such microgap channels and related the observed high-quality peak of an M-shaped heat transfer coefficient curve to the onset of local dryout. The present study utilizes infrared thermography to locate such nascent dryout regions and operating conditions. Data obtained with a 210 micron microgap channel, operated with a mass flux of 195.2 kg/m2 -s and heat fluxes of 10.3 to 26 W/cm2 are presented and discussed.

Copyright © 2010 by ASME

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